Improvement in circular-saw guides



J'. BRYCE 8a 0. GRQNBERG,

CIRCULAR SAW GUIDES. Ne.170,520, Patented Nov. 30,1875.

WITNESSES I INVENTORS I 1 A AAQAI! ATTORN EYS UNI ED STATES PATENTOFFIoE. 1

JOHN BRYCE AND OTTO GRONBERG, OFQGRAND HAVEN, MICHIGAN.

IMPROVEMENT IN CIRCULAR-SAW GUIDES.

Specification forming part of Letters Patent No. 170,520, dated November30, 1875; application filed October 30, 1875.

To all whom it may cancer Ii:

Be it known that we, JOHN BRYCE and 0'1- TO GRONBERG, of Grand Haven, inthe county of Ottawa and State of Michigan, have invented a new andvaluable Improvement in Circular-Saw Guides and we do hereby declarethat the following is a full, clear, and exact description of theconstruction and operation of the same, reference being had to theannexed drawings making a part of this specification, and to the lettersand figures of reference marked thereon.

Figure 1. of the drawings is a representation of a plan view of oursaw-guide, and Fig. 2 is a front view thereof. Fig. 3 is a longitudinalvertical sectional view of the same.

This invention has relation to circular-saw guides, which are designedfor preventing lateral vibration of such saws, and resisting lateralstrain. The nature of our invention and improvement consists in novelmeans for adjusting either one or both of the guide-arms according asthe size of the saw may vary, or the nature of the work may require, aswill be hereinafter explained.

In the annexed drawings, A B designate the guide-frame, which is slottedat a a for the purpose of receiving the bolts which secure it down toits place, and allowing it to be adjusted longitudinally on its bed. O Odesignate two guide-arms, one of which is straight and the otherrectangular, as shown in Fig. 1, and at the adjacent ends of theseguides pieces I) b of leather are confined, between which the saw turns.The guides G C have screws F F rigidly secured into their outer ends, onwhich are applied worm-wheels d d,

is done when changing saws.

has a hand-wheel, 9 applied on it, by means of which the worm-screw 0can be turned, and the outer guide 0 adjusted up to or from the guide 0.The worm-screw c is keyed on a tubular shaft, D, through which shaft Spasses, and on this shaft D a hand-wheel, g, is secured. By means ofthis hand-wheel g worm-screw a can be turned, and the guidearm 0adjusted toward or from the outer guide 0. Between the hubs of thehandwheels 9 g is a friction-collar, g and on the screw-threaded end ofthe shaft S is a nut, h. 7 By setting up the nuts h the two shafts D Scan be locked together, and both guide-arms can be adjusted together.Thehub of the worm-wheel d has an annular groove in it, which receives anotched retaining-plate, f, that is held down in place by means ofalatch, c. When the plate f is thrown up the arm 0 can be drawn out ofthe frame A B. This It is obvious that the worm-wheel 41 may be groovedand provided with plates corresponding to f and e.

What we claim, and desire to secure by Letters Patent, is

1. The guide-arms O 0, screws F F, wormwheels d d, Worm-screws cc, andshafts D S, combined and operating in the manner and for the purposesdescribed.

2. The retaining-plate f and latch e, in combination'with worm-wheels dd, and guidearms G O, as and for the purposes described.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

JOHN BRYCE.

OTTO .GRONBERG.

Witnesses:

JAMES C. AVERY, GEORGE A. BROWN.

